JP3901701B2 - Optical disc and optical disc recording apparatus - Google Patents

Description

  The present invention relates to an optical disc and an optical disc recording apparatus capable of forming visible information such as characters and images on the surface of the optical disc by using laser light from the optical disc recording apparatus, and particularly suitable for a thin optical disc recording apparatus. It is.

A conventional optical disk capable of forming visible information on the surface of an optical disk using laser light has a structure in which a data recording layer, a reflective layer, a heat-sensitive layer, and a transparent protective layer are laminated on a 1.2 mm substrate. Thus, it conforms to the so-called CD standard for optical discs. The heat-sensitive layer is made of a heat-sensitive material whose color changes when irradiated with laser light having a predetermined power or higher. The optical disk is mounted upside down on the turntable of the optical disk recording apparatus, and the thermal layer is rotated in a state of facing the optical pickup so that the laser beam of the optical pickup is focused on the thermal layer, and then the visible layer to be formed is to be formed. Visible information is formed by irradiating the heat-sensitive layer with laser light that is power-modulated based on information. (For example, refer to Patent Document 1.)
JP 2003-203348 A (page 19, FIG. 26, FIG. 27)

  However, in the conventional configuration, the optical disc pickup for a 1.2 mm substrate is used for forming visible information, and the laser beam of the optical pickup is focused on the thermal layer with the thermal layer facing the optical pickup. Therefore, the in-focus position differs by about 0.8 mm from the in-focus position of a normal optical pickup facing the optical pickup on the recording layer side. Therefore, it is necessary to take a wide movable range in the focus direction of the objective lens actuator in the optical pickup. As a countermeasure when the movable range in the focus direction of the objective lens actuator in the optical pickup is not sufficient, a structure in which an adapter having a predetermined thickness is sandwiched between the optical disk and the turntable, or driving in which the optical pickup is separated from the turntable by a predetermined amount. The structure which provides a mechanism is devised.

  However, in the configuration in which the in-focus position of the objective lens is greatly different as described above, a space margin of 0.8 mm or more is required in the height direction as compared with a normal optical disk recording apparatus, and a thin thickness of 12.7 mm or less is required. An optical disk recording apparatus has a problem that it is difficult to realize because there is no space. In a configuration in which an adapter having a predetermined thickness is sandwiched between the optical disk and the turntable, the gap between the disk clamps is greatly different. Therefore, it is difficult to secure a specified clamping force with the magnet clamp method, and the center hole of the optical disk is not formed. The mechanical clamp method of holding with clamp claws also has a problem that it is difficult to apply. Furthermore, since the user needs to set the adapter each time, there is a problem in operability, and there is also a problem that it cannot be applied to a slot loading type apparatus that directly inserts an optical disk from an insertion port of an optical disk recording apparatus. It was. Further, the configuration in which the drive mechanism for separating the optical pickup from the turntable by a predetermined amount has a problem that the device configuration becomes complicated and the device becomes expensive.

  The present invention solves the above-described problems of the conventional configuration, and can also be applied to a thin optical disk recording apparatus having an apparatus height of 12.7 mm or less. The laser beam of the optical disk recording apparatus is used to write characters on the surface of the optical disk. It is an object to provide an optical disc and an optical disc recording apparatus capable of forming visible information such as images and images.

In order to solve the conventional problem, the first optical disc of the present invention has a data recording layer formed on a transparent substrate having a base material thickness of 0.6 mm , and the data recording layer side of the transparent substrate is zero. is bonded protective substrate made .6mm substrate thickness, on the surface opposite to the data recording layer side of the protective substrate, an optical disk a visible information recording layer is provided that can form a visible information by irradiation of a laser beam there are, in the central portion of the visible information recording layer side of the optical disc, the visible information out come 0.2mm collision from the surface other than the central portion of the recording layer side, the protruding portion including a disk clamping area surface is formed It is characterized by that. The second optical disc of the present invention is an optical disc in which a data recording layer, a reflective layer, and a visible information recording layer capable of forming visible information by laser light irradiation are laminated on a transparent substrate having a thickness of 1.2 mm. In addition, a protrusion including the disk clamp area surface is formed at the central portion of the optical disc on the visible information recording layer side, protruding 0.2 mm from the surface other than the central portion on the visible information recording layer side. It is characterized by this. Also, the first or second optical disc of the present invention is an optically detectable FG pattern for synchronizing the disc motor rotation and disc location detecting on the peripheral portion of the surface including the disc clamping area surface of the protruding portion . it is characterized in that the reference patterns are formed. Further, the projecting portion is sticking configuration of 0.2mm thickness of the annular seal on the surface of the visible information recording layer side of the central portion, and the FG pattern on the annular seal and the reference pattern is formed It is characterized by this.

The optical disk recording apparatus of the present invention, the said data recording layer of the optical disk An optical disk recording apparatus capable of recording both the information of the visible information recording layer, and the disc motor turntable is provided, said disk laser for modulating a disc motor driving circuit for controlling the rotation of the motor, an optical pickup and an optical member corresponding respectively to the objective lens and 0.6mm substrate and 1.2mm substrate, a laser beam emitted from the optical pickup comprising a drive circuit, and an optical pickup transfer mechanism for moving the optical pickup in a radial direction of the optical disc, a photo coupler for detecting the FG pattern and the reference pattern formed on the projecting portion of the optical disk, and When forming visible information on the visible information recording layer of the optical disc The disk clamping area surface rotates the optical disc in a state mounted on the turntable, to control the rotation of the disk motor signal is input to the disk motor driving circuit from the FG pattern detected by the photocoupler In addition, a signal from the reference pattern detected by the photocoupler is input to the laser driving circuit, and a laser beam is focused on the visible information recording layer using an optical member corresponding to the 0.6 mm substrate. in, it is characterized in by irradiating a laser beam that will be modulated on the basis of visual information data in accordance with a disc rotation position, that is configured to form a visible information on the visible information recording layer.

  According to the optical disk of the present invention, the position of the heat-sensitive layer and the data information are recorded in a state where the optical disk is set on the turntable in order to record visible information in an optical disk shape conforming to the optical disk standard of CD and DVD. Therefore, the optical distance from the position of the data recording layer when the optical disk is set on the turntable can be made shorter than that of a conventional optical disk, so that the optical disk recording for recording data information and visible information on such an optical disk The amount of movement of the objective lens of the optical pickup mounted on the apparatus can be reduced.

Furthermore, according to the optical disk recording apparatus for recording visible information on the optical disk of the present invention, when recording visible information, an optical member corresponding to a 0.6 mm substrate is used. Compared to the case of using the data recording layer, the position of the objective lens that focuses the laser beam on the heat sensitive layer with the heat sensitive layer facing the optical pickup is the data recording layer with the recording layer side facing the optical pickup. focus close to the position of the objective lens, the offset amount required for the optical disk recording apparatus can be within the performance range of the normal focus actuator, as a result, additional functions for recording visible information in the optical disk recording apparatus In an optical disk recording apparatus equipped with an optical pickup corresponding to the present invention, a loading mechanism and a disk clamp are not required. Is applicable irrespective of the difference equations, in particular device height can also be applied to the following thin optical disc recording apparatus 12.7 mm.

Hereinafter, an optical disc and an optical disc recording apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
FIG. 1 shows a partial cross section of an optical disc according to the first embodiment of the present invention. FIG. 2 is a plan view of a protrusion of the optical disc according to the embodiment.

  In FIG. 1, an optical disk 1 is a laminate in which a transparent substrate 2 made of a 0.6 mm base material such as polycarbonate and a protective substrate 3 made of a 0.6 mm base material are bonded by an adhesive member 4 such as a UV curable resin. Disk configuration. Such a disc configuration is the same as that of a DVD disc. A guide groove (not shown) is formed on one side of the transparent substrate 2, and a data recording layer 5 and a reflective layer 6 are laminated on the guide groove surface. The inner peripheral portion of the protective substrate 3 includes a protruding portion 7 protruding from the surface, and the surface of the protruding portion 7 includes a disk clamp region surface 8. The protrusion 7 is integrally formed with the protective substrate 3 by injection molding. Further, an FG pattern 9 for disk motor rotation synchronization that can be detected optically and a reference pattern 10 for disk position detection are formed outside the disk clamp area surface 8 of the protrusion 7 (see FIG. 2).

  As shown in FIG. 2, the FG pattern 9 is a radial pattern having a constant width, and the reference pattern 10 is a pattern wider than the width of the FG pattern 9. The FG pattern 9 and the reference pattern 10 are concavo-convex patterns. A concavo-convex transfer pattern is formed on the mold, and is transferred to the protrusion 7 during injection molding. Note that the FG pattern 9 and the reference pattern 10 only need to be detected by a photocoupler, which will be described later.

  As shown in FIG. 1, a heat-sensitive layer 11 serving as a visible information recording layer and a transparent protective layer 12 are laminated on the surface of the protective substrate 3. The heat-sensitive layer 11 is made of a heat-sensitive material whose color changes when irradiated with laser light having a predetermined power or higher. An example of a heat-sensitive material suitable for the present invention is a microcapsule pigment having a pigment inside a capsule. When the microcapsule pigment is irradiated with laser light having a predetermined power or more, the microcapsule dissolves and develops color. The protective layer 12 is made of a hard coat material for surface protection used in optical disks, and the thickness of the protective layer 12 is 2 to 10 microns.

As for the thickness of the optical disc 1, the disc thickness of the disc clamp area surface 8 is 1.4 mm, and the other disc thicknesses are 1.2 mm. These values are in conformity with the DVD disc standard. In this embodiment, the projecting portion 7 is formed by integral molding. However, the projecting portion 7 is formed by attaching an annular seal 13 having a thickness of 0.2 mm as shown in FIG. 3 to an optical disc having a disc thickness of 1.2 mm. Also good. An FG pattern 9 and a reference pattern 10 are printed on the annular seal 13. When the annular seal 13 is used, an existing CD or DVD resin substrate can be used, so that no capital investment such as a new molding die is required.
(Embodiment 2)
FIG. 4 shows a partial cross section of an optical disc according to the second embodiment of the present invention.

In FIG. 4, an optical disk 21 is a transparent substrate 22 having a substrate thickness of 1.2 mm, such as polycarbonate. A guide groove (not shown) is formed on one side of the transparent substrate 22, and a data recording layer is formed on the guide groove surface. 23, a reflective layer 24, a heat sensitive layer 25, and a transparent protective layer 26 are laminated. The inner peripheral portion of the transparent substrate 22 has a protruding portion 27 protruding from the surface, and the surface of the protruding portion 27 is a disk clamp region surface 28. Regarding the thickness of the optical disc 21, the disc thickness of the disc clamp region surface 28 is 1.4 mm, and the other disc thicknesses are 1.2 mm. These values are values that conform to the CD disc standard. Since the configuration other than the above is the same as the configuration of the optical disc 1 according to the first embodiment, a detailed description thereof will be omitted.
(Embodiment 3)
FIG. 5 is a block diagram of an optical disc recording apparatus for forming visible information on the optical disc according to the first and second embodiments of the present invention. FIG. 6 is a diagram showing the configuration of the optical pickup of the optical disk recording apparatus. FIGS. 7A and 7B show data on the optical disk according to the first embodiment and the optical disk according to the second embodiment. FIG. 8 is a flowchart for explaining the operation of the optical disk recording apparatus of the present invention, and FIGS. 9A and 9B are visual information on the optical disk of the present invention. It is a figure which shows the positional relationship of the objective lens in the case of recording.

  As shown in FIG. 5, the optical disk recording device 31 includes a disk motor 33 provided with a turntable 32, a disk motor drive circuit 34 for controlling the rotation of the disk motor 33, the optical disk 1 or the optical disk 21 (hereinafter referred to as optical disks 1, 21). The optical pickup 35 for recording visible information, the RF amplifier 36, the optical pickup drive circuit 37, and the light connected to the stepping motor 38 for transporting the optical pickup 35 in the radial direction of the optical disks 1 and 21. Pickup transfer mechanism 39, photocoupler 40 for detecting FG pattern 9 and reference pattern 10 of optical disks 1 and 21, laser drive circuit 41 for modulating laser light emitted from optical pickup 35, controller 42, memory buffer 43, interface Consists of circuit 44 It has been.

  Here, the optical pickup 35 is a CD / DVD recording optical pickup capable of recording information on both a 1.2 mm CD disk and a 0.6 mm DVD disk. I will explain. The optical pickup 35 includes a laser detector integrated module 51 provided with a semiconductor laser having an oscillation wavelength of 635 nm, a laser detector integrated module 52 provided with a semiconductor laser having an oscillation wavelength of 780 nm, a polarizing beam splitter 53, a condensing lens 54, a mirror 55, A wave plate 56, an objective lens 57, a focus actuator 58, and a tracking actuator 59 are provided.

  Here, FIG. 7A shows a case where data is recorded / reproduced on / from an optical disc 1 having a 0.6 mm substrate, and FIG. 7B shows a case where data is recorded / reproduced on an optical disc 21 having a 1.2 mm substrate. In FIG. 7A, the light emitted from the laser detector integrated module 51 is transmitted through the polarization beam splitter 53, converted into a substantially parallel light beam by the condenser lens 54, reflected by the mirror 55, and the wave plate 56 and the objective lens. A light spot is formed on the data recording layer of the optical disc 1. The light beam reflected by the optical disk 1 returns along the same path and is received by the photodetector of the laser detector integrated module 51. The photodetector detects a reproduction signal and also detects a focus control signal and a tracking control signal. In FIG. 7B, the light beam emitted from the laser detector integrated module 52 is reflected by the polarization beam splitter 53, becomes a light beam slightly diverged by the condenser lens 54, is reflected by the mirror 55, and is reflected by the wave plate 56. A light spot is formed on the data recording layer of the optical disc 21 through the objective lens 57. The light beam reflected by the optical disc 21 returns along the same path, and is received by the photodetector of the laser detector integrated module 52.

  The operation of the optical disc recording apparatus 31 having the above configuration will be described. The optical disc recording apparatus 31 can record data on the data recording layers 5 and 23 of the optical discs 1 and 21, and can form visible information such as image data on the thermal layers 11 and 25. It is configured. Hereinafter, data recording and visible information forming operations will be described with reference to FIG.

  When the optical disks 1 and 21 are set on the turntable 32 of the optical disk recording device 31 (step S1), the disk motor 33 is rotated by the disk motor drive circuit 34 based on a command from the controller 42. Next, it is determined whether the photocoupler 40 detects the FG pattern 9 or the reference pattern 10 (step S2). When it is not detected, it can be seen that the data recording layers 5 and 23 of the optical disks 1 and 21 are set to face the optical pickup 35. On the other hand, when detected, it can be seen that the heat-sensitive layers 11 and 25 of the optical disks 1 and 21 are set so as to face the optical pickup 35. Although the method for detecting which surface is set toward the optical pickup 35 based on the presence or absence of detection of the FG pattern 9 or the reference pattern 10 has been described, the difference in the S-shaped output value of the focus error signal is detected. It may be. As described above, in this embodiment, the FG pattern 9, the reference pattern 10, or the difference in the S-shaped output value of the focus error signal is detected to determine the orientation of the optical disks 1 and 21 by detecting them. It is used as a means of use.

  If it is determined that the optical discs 1 and 21 are set so that the data recording layers 5 and 23 of the optical discs 1 and 21 face the optical pickup 35, the semiconductor laser of the optical pickup 35 is irradiated to the optical disc with reproduction power. Then, the optical disc 1 or the optical disc 21 is determined from the difference in the S-shaped output value of the focus error signal (step S3). When the set optical disk is the optical disk 1, the optical pickup 35 is set in the optical path of FIG. 7A and operated (step S4). On the other hand, when the set optical disk is the optical disk 21, the optical pickup 35 is set in the optical path of FIG. 7B and operated (step S6). Based on the signal from the RF amplifier 36, the focus actuator 58 and the tracking actuator 59 are operated by the control drive current from the optical pickup drive circuit 37 so that the light spot follows the track of the data recording layer of the optical disk. Next, the stepping motor 38 is driven to move the optical pickup transport mechanism 39 so that the optical spot follows a predetermined track to be recorded. The controller 42 records data information on the optical disk by modulating the laser light emitted from the optical pickup 35 by the laser driving circuit 41 based on the recording data supplied from the outside to the memory buffer 43 via the interface circuit 44 (step). S5, S7). The control method for recording the data information is the same as that of the conventional optical disc recording apparatus, and therefore detailed description is omitted.

  On the other hand, when it is determined that the optical disks 1 and 21 are set so that the heat-sensitive layers 11 and 25 of the optical disks 1 and 21 set face the optical pickup 35, the photo coupler 40 that detects the FG pattern 9 The FG signal is input to the disk motor drive circuit 34, and the disk motor 33 is rotated at a predetermined angular velocity. A reference signal from the photocoupler 40 that has detected the reference pattern 10 is input to the controller 42, and a timing signal for recording visible information is generated.

  The following description will be made assuming that the optical disc 1 is set. The optical pickup 35 is set on the optical path for the 0.6 mm substrate shown in FIG. 7A according to a command from the controller 42 (step S8), and the focus actuator 58 is driven by the optical pickup driving circuit 37, thereby the heat sensitive layer of the optical disc 1. The focus control is performed so that the light spot is focused on the beam 11. Since the optical disc 1 has a disc clamp region surface 8 protruding 0.2 mm from the heat-sensitive layer 11 of the protective substrate 3, the heat-sensitive layer 11 is located 0.2 mm away from the turntable 32 as shown in FIG. . This position is the position of the data recording layer 5 when the data recording layer 5 is set on the turntable 32 so as to face the optical pickup 35 in order to record data on the optical disc 1 (see FIG. 9A). Are separated by dimension d1 = 0.4 mm. Since this 0.4 mm is a distance through a polycarbonate having a refractive index of about 1.55, the optical distance is 0.26 mm of the dimension d2. Therefore, it is necessary to offset the objective lens 57 upward by 0.26 mm compared to the time of data recording. However, the movable range of the objective lens 57 of the focus actuator 58 is about 1.6 mm for a half-height optical disk recording apparatus and about 1.2 mm for an optical disk recording apparatus having a height of 12.7 mm. It is within the performance range of the actuator 58. Conventionally, as a countermeasure for exceeding the movable range of the focus actuator of the objective lens of the optical pickup, a structure in which an adapter having a predetermined thickness is sandwiched between the optical disk and the turntable, or a drive mechanism for separating the optical pickup from the turntable by a predetermined amount is provided. However, in this embodiment, it is not necessary to add such an additional mechanism.

  After the focus control, the stepping motor 38 is driven to transfer the optical pickup transfer mechanism 39 to a predetermined position (step S10). From such a position, the controller 42 performs control for recording the visible information data supplied from the outside to the memory buffer 43 via the interface circuit 44 in step S9. That is, the controller 42 generates a timing signal for recording visible information from the reference signal from the photocoupler 40 that has detected the reference pattern 10, and uses the timing signal as a starting point for the visible information data supplied to the memory buffer 43. Based on this, the laser driving circuit 41 is driven to pulse-modulate the laser light emitted from the optical pickup 35. Since the heat sensitive layer 11 dissolves and discolors at the peak power output of the pulse modulation, visible information for one round of the disk can be recorded on the heat sensitive layer 11 with the pulse modulated laser light (step S11). Thereafter, the stepping motor 38 is driven one step to move the optical pickup transfer mechanism 39 by a predetermined distance (step S12), and the visible information for one round is recorded by the above-described operation, and the visible information is completed in the heat sensitive layer 11. (Steps S13 and S14). The recording of visible information on the disk 21 is the same as the above-described operation, and thus the description thereof is omitted.

  As described above, according to the optical disks 1 and 21 of the present invention, the inner layers including the disk clamp area surfaces 8 and 28 on the heat sensitive layers 11 and 25 side which are visible information recording layers are provided on the heat sensitive layers 11 and 25 side. Protrusions 7 and 27 projecting from the surface are formed, and the optical distance from the end surfaces of the projecting parts 7 and 27 to the heat-sensitive layers 11 and 25 is the data recording layers 5 and 23 from the surface on the transparent substrate 2 or 22 side. In order to record visible information, the positions of the heat-sensitive layers 11 and 25 in a state where the optical disks 1 and 21 are set on the turntable 32 and data information are recorded. Therefore, the optical distance from the positions of the data recording layers 5 and 23 in a state where the optical disks 1 and 21 are set on the turntable 32 can be made closer than that of the conventional optical disk. 21 can be reduced the amount of movement of the objective lens 57 mounted on the optical pickup 35 to the optical disk recording apparatus 31 for recording the data information and the visual information. Therefore, as described above, the offset amount necessary for the optical disk recording device 31 can be within the performance range of the normal focus actuator 58, and according to the optical disk recording device of the present embodiment, a conventional additional mechanism is provided. Is not limited by the form of the optical disk recording device 31 and can be applied to any disk clamping method and disk loading method, and is particularly suitable for a thin optical disk recording device having a device height of 12.7 mm or less. It is.

  In this embodiment, the rotation control of the disk motor 33 is performed using the FG pattern 9 of the optical disks 1 and 21, but the FG pattern of the optical disk may not be used if the disk motor includes the FG.

An optical disc according to the present invention is an optical disc capable of recording visible information in a shape conforming to the standards of a DVD disc and a CD disc, and an optical disc recording apparatus for recording both data information and visible information on such an optical disc Since the in-focus position of the heat sensitive layer of the optical pickup used for recording is close to the in-focus position of the recording layer, an adapter having a predetermined thickness is sandwiched between the optical disc and the turntable in order to record visible information . Alternatively, it is not necessary to add a structure for providing a drive mechanism for separating the optical pickup from the turntable by a predetermined amount , and this is particularly useful for a thin optical disk recording apparatus having an apparatus height of 12.7 mm or less.

1 is a partial sectional view of an optical disc according to a first embodiment of the present invention. Plan view of the protrusion of the optical disk of the same embodiment The perspective view of the cyclic | annular seal used for the optical disk based on the embodiment Partial sectional view of an optical disk according to a second embodiment of the present invention 1 is a block diagram of an optical disc recording apparatus for forming visible information on an optical disc according to first and second embodiments of the present invention. The figure which shows the structure of the optical pick-up of the optical disk recording device (A) is a figure which shows the optical path | route of the optical pick-up in the case of recording / reproducing data on the optical disk based on 1st Embodiment, (b) is the case where data is recorded / reproduced on the optical disk based on 2nd Embodiment. Showing the optical path of the optical pickup Flow chart for explaining the operation of the optical disk recording apparatus (A) And (b) is a figure which shows the positional relationship of the objective lens in the case of recording visible information on the optical disk of this invention, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Transparent substrate 3 Protective substrate 4 Adhesive member 5 Data recording layer 6 Reflective layer 7 Projection part 8 Disc clamp area surface 9 FG pattern 10 Reference pattern 11 Thermal layer 12 Transparent protective layer 13 Annular seal 31 Optical disk recording device 32 Turntable 33 Disc motor 34 Disc motor drive circuit 35 Optical pickup 36 RF amplifier 37 Optical pickup servo circuit 38 Stepping motor 39 Optical pickup transfer mechanism 40 Photo coupler 41 Laser drive circuit 42 Controller 43 Memory buffer 44 Interface circuit 51, 52 Laser detector integrated module 57 Objective lens 58 Focus actuator 59 Tracking actuator

Claims (5)

Data recording layer is formed on a transparent substrate made of a 0.6mm substrate thickness, the is the data recording layer side protective substrate made of a 0.6mm substrate thickness on the transparent substrate is adhered, the data of the protection substrate on the surface opposite to the recording layer side, there is provided an optical disk which visible information recording layer is provided that can form a visible information by irradiation of a laser beam, the center portion of the visible information recording layer side of the optical disc, the optical disc, characterized in that the visible information out come 0.2mm collision from the surface other than the central portion of the recording layer side, the protruding portion including a disk clamping area surface is formed. An optical disc in which a visible information recording layer capable of forming visible information by irradiation of a data recording layer, a reflective layer, and laser light is laminated on a transparent substrate having a thickness of 1.2 mm, and the visible information recording layer of the optical disc An optical disc characterized in that a protruding portion including a disc clamping area surface protruding 0.2 mm from a surface other than the central portion on the visible information recording layer side is formed in the central portion on the side . An optically detectable disk motor rotation synchronization FG pattern and a disk position detection reference pattern are formed on the peripheral edge of the surface including the disk clamp area surface of the protrusion. optical disk according to claim 1 or 2. The projecting portion is sticking configuration the annular seal 0.2mm thickness on the surface of the central portion of the visible information recording layer side, characterized in that said FG pattern on the annular seal and the reference pattern is formed The optical disc according to claim 3. An optical disc recording apparatus capable of recording information on both the data recording layer and the visible information recording layer of the optical disc according to claim 3 ,
A disk motor equipped with a turntable;
A disk motor driving circuit for controlling the rotation of the disk motor,
An optical pickup having an objective lens and optical members respectively corresponding to a 0.6 mm substrate and a 1.2 mm substrate ;
A laser drive circuit for modulating a laser beam emitted from the optical pickup,
An optical pickup transfer mechanism for moving the optical pickup in a radial direction of the optical disc,
The FG pattern formed on the protruding portion of the optical disc and a photocoupler for detecting the reference pattern ,
When forming the visible information on the visible information recording layer of the optical disc, the rotating the optical disk disk clamping area surface while wearing the turntable, the signal from the FG pattern detected by the photocoupler Is input to the disk motor drive circuit to control the rotation of the disk motor, and a signal from the reference pattern detected by the photocoupler is input to the laser drive circuit, and the optical system corresponding to the 0.6 mm substrate is supplied. in a state where the laser beam was focused point on the visible information recording layer using a member, by irradiating a laser beam that will be modulated on the basis of visual information data in accordance with the disk rotation position, visible in the visible information recording layer An optical disc recording apparatus configured to form information.

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